Influence of Loading Direction and Weld Reinforcement on Fatigue Performance of TIG Weld Seam

HUI Li; LIU Si-qi; ZHOU Song; WANG Lei; MA Chuang; ZHAO Qiang

doi:10.11868/j.issn.1001-4381.2016.001177

Cailiao gongcheng (Feb 2018)

Influence of Loading Direction and Weld Reinforcement on Fatigue Performance of TIG Weld Seam

HUI Li,
LIU Si-qi,
ZHOU Song,
WANG Lei,
MA Chuang,
ZHAO Qiang

Affiliations

HUI Li: Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, China
LIU Si-qi: Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, China
ZHOU Song: Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, China
WANG Lei: Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, China
MA Chuang: Key Laboratory of Fundamental Science for National Defence of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, China
ZHAO Qiang: Shenyang Liming Aero-engine Group Co., Ltd., Shenyang 110043, China

DOI: https://doi.org/10.11868/j.issn.1001-4381.2016.001177
Journal volume & issue: Vol. 46, no. 2
pp. 122 – 127

Abstract

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The influence of loading direction and weld reinforcement on fatigue performance of TC2 titanium alloy TIG weld seam was investigated via fatigue experiments and SEM fracture observation. The results show that the fatigue life of retaining weld reinforcement specimens is lower than that of removing one in the same weld direction. The fatigue life of oblique weld specimens is higher than that of straight one with the same weld reinforcement treatment. The initiation of removing weld reinforcement specimens' fatigue crack sources is in the hole defect, but the weld reinforcement specimen initiate at the weld toes. During the early stage of fatigue crack propagation, the cracks all grow inside the weld seam metal with obvious fatigue striation. And the fatigue cracks of oblique weld specimens pass through the weld seam into the base with a typical toughness fatigue striation during the last stage of fatigue crack propagation. The dimple of straight weld specimens is little and shallow in the final fracture zone. The oblique weld specimens broke in the base metal area, and the dimple is dense.

Published in Cailiao gongcheng

ISSN: 1001-4381 (Print)
Publisher: Journal of Materials Engineering
Country of publisher: China
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: http://jme.biam.ac.cn/CN/1001-4381/home.shtml

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